The Infiniti I35, produced from 1998 to 2004, represented Infiniti’s entry into the mid-size luxury sedan segment, aiming to compete with established American and European brands. Positioned as a more performance-oriented alternative to the Nissan Maxima (with which it shared its platform – the D-platform), the I35 offered a blend of luxury, performance, and technology. This specific variant, powered by the 3.5-liter V6 engine paired with a four-speed automatic transmission, was a mainstay of the I35 lineup throughout its production run, offering a balance between spirited driving and everyday usability. It served as the primary volume seller, appealing to buyers seeking a comfortable and refined driving experience without sacrificing power.
Technical Specifications
| Brand | Infiniti |
| Model | I35 |
| Generation | I35 |
| Type (Engine) | 3.5 i V6 24V (259 Hp) |
| Start of production | 1998 |
| End of production | 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 12.4 l/100 km (19 US mpg) |
| Fuel consumption (extra urban) | 9 l/100 km (26.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 62 mph | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 5.8 kg/Hp |
| Weight-to-torque ratio | 4.5 kg/Nm |
| Power | 259 Hp @ 5800 rpm |
| Power per litre | 74 Hp/l |
| Torque | 333 Nm @ 4400 rpm (245.61 lb.-ft. @ 4400 rpm) |
| Engine layout | Front, Transverse |
| Engine displacement | 3498 cm3 (213.46 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 95.5 mm (3.76 in.) |
| Piston Stroke | 81.4 mm (3.2 in.) |
| Compression ratio | 10.1:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Kerb Weight | 1515 kg (3340 lbs.) |
| Trunk (boot) space | 420 l (14.83 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4920 mm (193.7 in.) |
| Width | 1785 mm (70.28 in.) |
| Height | 1430 mm (56.3 in.) |
| Wheelbase | 2750 mm (108.27 in.) |
| Front track | 1530 mm (60.24 in.) |
| Rear track | 1510 mm (59.45 in.) |
| Drivetrain Architecture | Front wheel drive |
| Drive wheel | Front wheel drive |
| Number of gears | 4 |
| Gearbox type | automatic transmission |
| Front suspension | Coil spring |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 225/50 R17 |
Powertrain & Engine Architecture
The heart of the I35 was the VQ35DE 3.5-liter V6 engine. This engine, a member of Nissan’s highly regarded VQ engine family, was known for its smooth operation, robust construction, and ample power. The VQ35DE featured a 60-degree V-angle, dual overhead camshafts (DOHC), and four valves per cylinder. The multi-port fuel injection system delivered fuel directly to each cylinder, optimizing combustion efficiency. The engine’s block was constructed from cast iron, while the cylinder heads were made of aluminum, contributing to a favorable weight balance. Paired with the engine was a Jatco four-speed automatic transmission, chosen for its smooth shifting and ease of use. While not as sporty as a manual transmission, the automatic was well-suited to the I35’s intended market as a comfortable and refined luxury sedan. The transmission featured electronically controlled torque converter lock-up for improved fuel efficiency at highway speeds.
Driving Characteristics
The I35 3.5L automatic offered a comfortable and capable driving experience. The 259 horsepower and 245 lb-ft of torque provided brisk acceleration, with 0-60 mph times consistently in the high 7 to low 8-second range. While the automatic transmission wasn’t as quick-shifting as some competitors, it provided smooth and predictable gear changes. Compared to the five-speed manual transmission available on some I35 models, the automatic prioritized comfort over outright performance. The automatic’s gear ratios were tuned for relaxed cruising and effortless passing power. The front-wheel-drive layout provided good traction in most conditions, although it could exhibit some torque steer under hard acceleration. The suspension was tuned for comfort, absorbing bumps and imperfections in the road with ease. Steering was light and precise, making the I35 easy to maneuver in city traffic.
Equipment & Trim Levels
The I35 with the 3.5L V6 and automatic transmission typically came well-equipped, even in its base form. Standard features included air conditioning, power windows and locks, a CD player, and alloy wheels. Higher trim levels, such as the Premium package, added features like leather upholstery, a sunroof, heated seats, and a Bose audio system. Optional extras included navigation, a premium sound system upgrade, and various cosmetic enhancements. Interior upholstery was typically cloth on base models, with leather available as an upgrade. The dashboard featured a straightforward layout with easy-to-read gauges and intuitive controls.
Chassis & Braking
The I35 utilized a front-engine, front-wheel-drive layout. The suspension consisted of independent coil springs and struts in the front, and a multi-link coil spring suspension in the rear. This setup provided a comfortable ride while maintaining reasonable handling characteristics. Braking duties were handled by ventilated discs in the front and solid discs in the rear. Anti-lock brakes (ABS) were standard, enhancing safety and control during emergency braking situations. The I35’s chassis was designed to provide a balance between rigidity and weight, contributing to its overall stability and handling.
Market Reception & Comparison
The Infiniti I35 was generally well-received by automotive critics. It was praised for its powerful engine, comfortable ride, and spacious interior. However, some critics noted that the four-speed automatic transmission felt dated compared to the five-speed automatics offered by some competitors. Fuel economy was considered average for its class. Compared to the Nissan Maxima, the I35 offered a more luxurious interior and a more refined driving experience. Compared to European rivals like the BMW 3 Series and Audi A4, the I35 offered a more affordable price point, but lacked the same level of sporting prowess. The I35’s reliability was generally good, although some owners reported minor issues with the automatic transmission over time.
Legacy
The Infiniti I35, particularly the 3.5L V6 automatic variant, has proven to be a relatively reliable and durable vehicle. The VQ35DE engine is known for its longevity, and many examples are still on the road today with high mileage. The automatic transmission, while not without its occasional issues, has generally held up well over time. In the used car market, the I35 represents a good value for buyers seeking a comfortable and well-equipped mid-size sedan. Its relatively simple mechanical design makes it easier and more affordable to maintain than some of its more complex European counterparts. The I35 laid the groundwork for Infiniti’s continued success in the luxury sedan segment, establishing the brand as a credible alternative to established players.
